1 /*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "BackingStore.h"
28
29 #include "ShareableBitmap.h"
30 #include "UpdateInfo.h"
31 #include <WebCore/BitmapInfo.h>
32 #include <WebCore/GraphicsContext.h>
33 #include <WebCore/IntRect.h>
34
35 using namespace WebCore;
36
37 namespace WebKit {
38
39 class BitmapDC {
40 WTF_MAKE_NONCOPYABLE(BitmapDC);
41
42 public:
43 BitmapDC(HBITMAP, HDC destinationDC);
44 ~BitmapDC();
45
operator HDC() const46 operator HDC() const { return m_dc.get(); }
47
48 private:
49 OwnPtr<HDC> m_dc;
50 HBITMAP m_originalBitmap;
51 };
52
BitmapDC(HBITMAP bitmap,HDC destinationDC)53 BitmapDC::BitmapDC(HBITMAP bitmap, HDC destinationDC)
54 : m_dc(adoptPtr(::CreateCompatibleDC(destinationDC)))
55 , m_originalBitmap(static_cast<HBITMAP>(::SelectObject(m_dc.get(), bitmap)))
56 {
57 }
58
~BitmapDC()59 BitmapDC::~BitmapDC()
60 {
61 ::SelectObject(m_dc.get(), m_originalBitmap);
62 }
63
paint(HDC dc,const IntRect & rect)64 void BackingStore::paint(HDC dc, const IntRect& rect)
65 {
66 ASSERT(m_bitmap);
67 ::BitBlt(dc, rect.x(), rect.y(), rect.width(), rect.height(), BitmapDC(m_bitmap.get(), dc), rect.x(), rect.y(), SRCCOPY);
68 }
69
createBitmap(const IntSize & size)70 static PassOwnPtr<HBITMAP> createBitmap(const IntSize& size)
71 {
72 // FIXME: Maybe it would be better for performance to create a device-dependent bitmap here?
73 BitmapInfo info = BitmapInfo::createBottomUp(size);
74 void* bits;
75 return adoptPtr(::CreateDIBSection(0, &info, DIB_RGB_COLORS, &bits, 0, 0));
76 }
77
incorporateUpdate(ShareableBitmap * bitmap,const UpdateInfo & updateInfo)78 void BackingStore::incorporateUpdate(ShareableBitmap* bitmap, const UpdateInfo& updateInfo)
79 {
80 if (!m_bitmap)
81 m_bitmap = createBitmap(m_size);
82
83 scroll(updateInfo.scrollRect, updateInfo.scrollOffset);
84
85 IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
86
87 BitmapDC dc(m_bitmap.get(), 0);
88 GraphicsContext graphicsContext(dc);
89
90 // Paint all update rects.
91 for (size_t i = 0; i < updateInfo.updateRects.size(); ++i) {
92 IntRect updateRect = updateInfo.updateRects[i];
93 IntRect srcRect = updateRect;
94 srcRect.move(-updateRectLocation.x(), -updateRectLocation.y());
95
96 bitmap->paint(graphicsContext, updateRect.location(), srcRect);
97 }
98 }
99
scroll(const IntRect & scrollRect,const IntSize & scrollOffset)100 void BackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
101 {
102 if (scrollOffset.isZero())
103 return;
104
105 RECT winScrollRect = scrollRect;
106 ::ScrollDC(BitmapDC(m_bitmap.get(), 0), scrollOffset.width(), scrollOffset.height(), &winScrollRect, &winScrollRect, 0, 0);
107 }
108
109 } // namespace WebKit
110